public StringCharacterIterator(String src) 
{
        this.src = src;
}

Parameters:

src - - encapsulated String

 public char charAt(int pos) 
{
        return src.charAt(pos);
}

 public boolean isEnd(int pos) 
{
        return (pos  >= src.length());
}

 public String substring(int beginIndex) 
{
        return src.substring(beginIndex);
}

 public String substring(int beginIndex,
    int endIndex) 
{
        return src.substring(beginIndex, endIndex);
}